How many kilometers can a run-flat tire run without air?
2 Answers
How far a run-flat tire can travel without air varies depending on the brand. Generally, at a speed not exceeding 80KM/H, it can run approximately 80 kilometers. It's important to note that the function of a run-flat tire is not to allow the driver to continue driving when problems arise, but mainly to prevent the vehicle from losing control in the event of sudden tire pressure loss. The following situations indicate that a run-flat tire cannot be repaired: 1. The puncture is too large, exceeding 4.2 millimeters. 2. The punctured area is on the tire sidewall and cannot be repaired. 3. The tire is punctured and leaks air, causing damage during driving. 4. The tire has been repaired twice and cannot be repaired again.
I've driven quite a few cars equipped with run-flat tires. These tires can still run for a while when deflated, typically around 80 kilometers, but this isn't absolute. Speed is the most significant factor—it's recommended not to exceed 80 kilometers per hour. Driving faster can cause severe tire wear, potentially reducing the actual distance to around 50 kilometers. Additionally, vehicle load is crucial. If the car is carrying four passengers or the trunk is fully loaded, the increased tire load will reduce the run-flat distance. Road conditions also matter—smooth highways may allow for longer distances, but bumpy or slippery surfaces can accelerate wear. I remember one weekend trip when my tire suddenly went flat. I slowed down to about 60 kilometers per hour and managed to drive roughly 70 kilometers to a repair shop, only to find the tire edges slightly damaged. These tires rely on specially reinforced sidewalls for emergency support, so if you notice an issue, immediately reduce speed, choose a smooth route straight to a repair shop, and avoid pushing for speed to prevent vehicle damage or accidents.
